JP3707992B2 - Photosensitive material processing method and photosensitive material processing apparatus - Google Patents

Photosensitive material processing method and photosensitive material processing apparatus Download PDF

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Publication number
JP3707992B2
JP3707992B2 JP2000128652A JP2000128652A JP3707992B2 JP 3707992 B2 JP3707992 B2 JP 3707992B2 JP 2000128652 A JP2000128652 A JP 2000128652A JP 2000128652 A JP2000128652 A JP 2000128652A JP 3707992 B2 JP3707992 B2 JP 3707992B2
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photosensitive material
processing
liquid
slit
coating
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JP2001312036A (en
JP2001312036A5 (en
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伸 中川
邦浩 福島
利仁 丸山
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Mitsubishi Paper Mills Ltd
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Mitsubishi Paper Mills Ltd
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Priority to DE10063216A priority patent/DE10063216B8/en
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Description

【0001】
【発明の属する技術分野】
本発明は、感光材料の処理方法及び処理装置に関する。詳しくは、スロットダイを用いて処理液を塗布する処理方法及び処理装置に関する。
【0002】
【従来の技術】
フィルム、印画紙、印刷版等の感光材料は画像が記録された後に、現像液、定着液、安定化液、水洗水等の処理液によって処理される。このような処理を行なう感光材料の処理装置としては、複数の搬送ローラー対等により構成される搬送手段により、処理液を貯留した処理槽中に感光材料を搬送し、感光材料を処理液中に浸漬することにより処理を行なう浸漬型の処理装置が知られている。
【0003】
このような浸漬型の処理装置においては、感光材料の処理に伴う処理疲労、あるいは大気中の炭酸ガスや酸素による経時疲労等により処理液が劣化するため、処理液に補充液を補充することにより処理液の劣化を回復させている。このため、処理開始時の処理液の成分と、その後も処理を継続した場合の処理液の成分とは異なることになり、厳密に均一な処理を行なうことは不可能である。また、このような浸漬型の処理装置は、処理液の使用量および廃液量が多くランニングコストが高い、また、装置のメンテナンス性が悪いという問題もある。
【0004】
このような問題点を解消するための感光材料処理装置として、例えば、特開昭62−237455号公報に記載されているように、感光材料を処理液中に浸漬するかわりに、感光材料の処理に必要なだけの処理液を感光材料の感光面に塗布して処理を行なう塗布方式の処理装置も使用されている。例えば、特開昭62−237455号公報においては、このような塗布方式の処理装置として、複数の処理液吐出孔を有する処理液供給ノズルから、その表面に溝を形成すること等によりその表面を粗面化したローラー(以下「粗面化ローラー」と呼称する)に処理液を吐出するとともに、この粗面化ローラーを介して感光材料に当接して回転させることにより、処理液を塗布する処理装置が開示されている。
【0005】
しかしながら上記特開昭62−237455号公報に記載された処理装置においては、感光材料の感光膜に傷がつくという問題点があった。また処理に要するランニングコストの観点や環境問題等の観点から処理液の使用量を極力少量とすることが好ましいが上記の処理装置においては、処理液供給ノズルに供給される処理液の量を少量とした場合には、複数の処理液孔から粗面化ローラーに吐出される処理液の供給量を均一とすることが困難となり、これに伴って処理液の量が不均一となるという問題点もある。
【0006】
この問題を改善すべく実開平6−8956号公報、特開平6−27677号公報に、上方に処理液供給部を有し下端がスリット状開口となっており該開口部を経て処理液を塗布する処理装置が開示された。この処理装置によって原理的には所望する目的は達せられるものの、塗布器としての性能と安定性に問題がある。すなわち、供給口とスリットが直結されているので処理液が塗布器の全幅にわたって均一に広がりにくいこと、スリット先端と感光材料面が接触しているので安定したメニスカスが形成されにくいという原理的な問題がある。これによって、感光材料の塗布幅方向と流れ方向の塗布量不均一、また塗布面質においても縦筋状のムラや液割れ(塗布工学上のいわゆるリビュレット)が発生しやすい。該問題は処理液の流量(換言すれば湿潤塗布量)を増大させれば解消の方向となるものの、必要以上に塗布量を増やすと後工程などで余剰分を排除する必要が生じて結果的には廃液が生じることとなる。
【0007】
上記した問題に鑑み、本発明者らは、スロットダイを用いて少ない処理液量でも安定に均一に塗布でき、さらに実質的に廃液が生じない処理装置を特願平11−361027にて提案した。しかしながら、感光材料のなかには、端部から均一な現像処理が要求されるものがあり、特に極先端部(例えば先端1cm以内)の処理むらが問題になる場合があった。この現象は特に塗布量を少なくすると起こりやすかった。
【0008】
【発明が解決しようとする課題】
本発明の目的は、前記の特願平11−361027の更なる改良を行なうもので、感光材料端部の塗布開始部分における塗布不均一とそれによる処理ムラが解消された処理方法及び処理装置を提供することにある。
【0009】
【課題を解決するための手段】
本発明の上記目的は、少なくともスリットとマニホールドからなるスロットダイを用いて、前記スリットより落下する処理液を感光材料に塗布する処理方法であって、前記スリットの先端部と対向し離間する位置に、塗布幅と同等もしくはそれ以上の長さを有する部材を設置し、前記感光材料が前記スリット部に到達するに先立ち、前記スリット先端部と前記部材の間に、静止状態の処理液の膜あるいは静止していない処理液の膜を形成させることを特徴とする感光材料の処理方法によって達成された。
【0010】
また、上記した本発明の処理方法を実施するのには、少なくともスリットとマニホールドからなるスロットダイを用いて感光材料に処理液を塗布する感光材料用処理装置であって、前記スリットの先端部と対向する位置に、塗布幅と同等もしくはそれ以上の長さを有する部材を、前記スリット先端部から3mm以内に離間設置せしめたことを特徴とする感光材料用処理装置が好適である。
【0011】
【発明の実施の形態】
以下添付図面にしたがって本発明を具体的に説明するが、本発明はこれら図面の態様に何ら限定されるものではない。図1に本発明の好ましい態様を断面図で示す。
【0012】
1はスロットダイである。材質は特に限定されるものではないが、処理液に対する耐食性と機械的精度を満足できればよく、例えばステンレス鋼が好ましい。その他にも一般構造鋼にクロムメッキしたものやプラスチック類等が使用可能である。なお、金属で製作する場合は機械加工時の応力歪を排除するため、予め焼鈍処理を施してもよい。
【0013】
スロットダイ1の構造を説明する。8は処理液供給口でマニホールド9と連結されている。該マニホールド9は流入した処理液を幅方向に広げるためのものであり、前出の実開平6−8956号公報、特開平6−27677号公報には具備しない要素である。該マニホールドで処理液を一旦幅方向に充満させた後、スリット部10に供給する作用を行なう結果、スリット部10からの流出流量を幅方向に均一化させることが可能となる。処理液供給口8は通常スロットダイの幅方向の中心に1箇所設けることでよいが、スロットダイの幅方向の複数箇所に設けてもよい。マニホールド9の断面形状は、本態様では円形となっているがこれに限らず任意の形状でよい。またマニホールド9の断面積はスロットダイの幅方向に亘り一定でなくてもよく、例えば流出する処理液の幅方向の流量均一性をさらに向上せしめるために端部に至るに従って断面積を漸減させてもよい。
【0014】
図1には便宜上図示しないが、スロットダイ1のマニホールド部の塗布幅方向両端部とスリット部の同両端部は、処理液が流出しないように栓をして用いる。この場合、処理しようとする感光材料の塗布幅に対しスリット部の幅方向有効長さが同じか多少大きくなるように前述の栓を施す。
【0015】
2は感光材料で、図示しない駆動装置により図の左から右方向に搬送される。搬送中の感光材料2の先頭端部を感材検出器7で検出し、その信号によりポンプ5を駆動しバルブ6を開にしてスロットダイ1に処理液4を供給し、感光材料の終端部を検出してポンプ5を停止しバルブ6を閉止するというのが基本的な制御フローとなるが、感光材料2の搬送速度と、感材検出器7からスロットダイ1のスリット部に至るまでの距離を演算(演算装置は図示せず)して、ポンプ5を駆動/停止するタイミングを適宜制御することにより処理液4のロスを実質的に無くすことが可能である。
【0016】
本発明に用いるポンプとしては特に限定するものではないが、ポンプの構造上の回転数(ギアポンプ等の場合)やストロ−ク数(ダイヤフラム式等の振動式ポンプの場合)などが可変式なものすなわち定量ポンプが好ましい。また、処理液の塗布を均一なものとするため脈動と称する流量の不均一の少ないポンプが好ましい。場合によってはポンプ以降の配管道中に例えばエアーダンパー式の脈動防止器を設置してもよい。また、シリンジ式の液供給装置も好ましく使用できる。
【0017】
本態様では、処理液の供給にポンプを使用する例を示したが、その他にも例えば処理液をスロットダイより高位置に配して水頭によって自然落下させる方式でもよい。この場合はポンプが不要となり、バルブの開閉のみで処理液の供給が可能である。なおこの場合、前記バルブを定量式とすることや、流路に例えばニードルバルブ付きのフローメータを配して予め所望する流量となるように開度調節しておくことで流量制御が可能である。自然落下方式であっても、感材検出器7の信号によるバルブの開閉タイミングを前述のポンプ式の場合と同様な制御を行なうことによって、処理液のロスを実質的に無くすことが可能である。
【0018】
感光材料への塗布量に極めて精度を要する場合は、処理液配管の道中に流量計を配置して該流量計の信号を基準にして前述のポンプや定量バルブをフィードバック制御する構成をとることができる。
【0019】
処理液のスロットダイへの供給流量は、所望する処理液の湿潤塗布量と感光材料の塗布幅と感光材料の搬送速度をそれぞれ乗ずることにより決定することができる。
【0020】
搬送ローラー3は駆動・非駆動のいずれでもよく、またローラーの材質としても特に限定するものではなく従来の感材処理装置で採用されているもので差し支えない。なお、処理液の塗布安定性を考慮して感光材料がほぼ水平に搬送されるようにローラーを配することが好ましい。
【0021】
本態様には図示しないが、処理液塗布時に微量の余剰分が発生する可能性を考慮して、スロットダイの下方に液受け皿等を配してこれを回収してもよい。
【0022】
本発明の特徴は、スロットダイ1のスリット10の鉛直下方の離間した位置に、塗布幅と同等かもしくはそれ以上の長さを有する部材11を配したことにあり、スリット10の先端部と部材11の間に処理液の膜13を形成させることである。以降、部材11を液膜形成部材と称す。上下装置12は液膜形成部材11の上下方向の位置決めを行なうものであり、本発明の実施にあたって具備させておけば好ましい作用効果を発揮する。例えば処理する感光材料の種々の厚みに対応できたり、処理液の塗布条件(湿潤塗布量や処理速度)に対する液膜形成部材11の最適位置への位置決めが可能となる。また処理装置が休止しているときには、液膜形成部材11をスロットダイの先端部に密着させて処理液の漏れ防止を図ることもできる。図1ではシリンダー式アクチュエーターを例示したが、上下運動が可能であればこれに限定されるものではない。
【0023】
液膜形成部材11は塗布幅方向にはスロットダイの塗布幅以上とし、スリット10の先端部に対向する部分は平面からなることが好ましい。即ち、感光材料の流れ方向(図1のL)には1mm以上の長さの平面を有することが好ましく、更に好ましくは2mm以上であるが、上限は10mm程度あれば充分でこれ以上大きくする必要はない。材質は処理液に対する耐食性があれば特に制限されず、例えばステンレス鋼、プラスチック類、フッソ系樹脂(テフロン等)などを用いることができる。
【0024】
液膜形成部材11とスリット10の先端部(スロットダイ1の先端部)の距離Hについて詳述する。少ない塗布量で全幅方向に均一な処理液膜13を形成させるためのは、上記距離Hは3mm以内が好ましく、より好ましくは2mm以内で、更に好ましくは1.5mm以内で、特に好ましくは1.0mm以内である。距離Hの下限は、感光材料2の感光面がスリット10の先端部(スロットダイ1の先端部)に接触しない距離である。また、液膜形成部材11の上面すなわち処理液接液面は感光材料2の下面レベルと同等ないしは感光材料が衝突しない程度に下側にオフセットさせておくのが好ましい。加えて、前記処理液接液面は水平面であることが好ましい。これにより、処理液膜13がスロットダイ先端部に充分接触した状態すなわち本発明の効果を発揮しやすい状態で形成し維持することが可能となる。
【0025】
本発明は、処理液の塗布量を極力少なくして、廃液を実質的に生じない処理方法を目指しており、その意味において処理液の塗布量は1平方メートル当たり50ミリリットル以下が好ましく、より好ましくは40〜20ミリリットル程度である。このように塗布量を少なくすると感光材料先端部の均一な処理が難しくなる。これは、塗布量が少ないと塗布開始時においてはスリットから流出し落下する処理液が液滴状ないしはスダレ状となるがゆえに、塗布不均一を来していたと考えられる。この問題を解決するために、本発明は、塗布に先立ち、あらかじめスリット10(スロットダイ1)の先端部に液膜形成部材11とともに全幅方向に処理液膜を形成するというものである。
【0026】
本発明においては、感光材料が塗布されるに先立ちスロットダイ先端部と液膜形成部材11の間に処理液膜13を生成させておく。処理液膜13は、前述のHに関する記述、液膜形成部材11に関する記述に従ったうえで処理液を供給して生成させる。例えば感光材料2の通過を感材検出器7が検出した信号をきっかけとしてポンプ5の駆動時間をタイマー(図示せず)で制御する方法がある。また、ポンプのかわりに前述のシリンジ式液供給装置を用いる場合は、上記の信号をきっかけとして一定量の処理液を押し出すという方法もある。前述のいずれの方法においても、ポンプやシリンジ式液供給装置が駆動状態から停止状態になったタイミングでバルブ6を閉止することにより、処理液膜13を静止状態で安定して維持することができる。また、処理液の若干の廃液が許容される場合については、処理液膜13が生成した状態でポンプ5を停止せずにそのまま感光材料2に塗布する方法でもよい。
【0027】
本発明者らは、処理液膜13を生成させた状態で感光材料2に塗布することにより、感光材料端部の塗布開始部分において塗布が不均一となり、それによる現像ムラが発生しやすいという従来の懸案点を解消できることを見出した。スロットダイを用いた処理方法や処理装置においては、塗布開始時においてはスリットから流出し落下する処理液は液滴状ないしはスダレ状となるがゆえに、塗布不均一を来していたと考えられるが、本発明によれば全幅にわたる完全な液膜状態から塗布が始まるので前述の塗布不均一は生じない。さらに、スロットダイ方式を用いてシート状物に塗布する際にはその開始点において、スリット10から流出する処理液の幅方向の流量分布が定常状態に達していないこと、さらにポンプ等の液供給装置の駆動開始時点での流量が所望する量に達していないことに起因した塗布不均一に対しても本発明ではこれを補完することができる。
【0028】
【実施例】
以下に本発明を実施例により説明する。
感光材料として0.25mm厚のアルミニウム板を支持体とする、銀錯塩拡散転写法を利用したアルミニウム平版印刷版(菊全サイズ)をレーザーを光源とする出力機で画像出力したものを用いた。前記の印刷版を処理する処理液の組成を下記に示す。

Figure 0003707992
【0029】
本発明にしたがって上記処理液の塗布テストを行なった。このときスリット10の先端部と液膜形成部材11の距離Hは、0.95mmとした。また、液膜形成部材11の上面は感光材料2の下面レベルより下側に0.2mmとした。液膜形成部材11の上面は、長さLが3mmの平面である。感光材料の搬送速度(塗布速度)は毎秒1.5cm、処理液の湿潤塗布量は1平方メートルあたり30ミリリットルから90ミリリットルまで10ミリリットルステップで変化させた。
【0030】
比較例として、液膜形成部材11を取り外して前述と同様の条件で塗布テストを行なった。
【0031】
本発明の実施例と比較例を表1にまとめた。表1では現像液の塗布量に対する感光材料の特に塗布開始端の塗布面質(現像ムラを眼視)を評価した。
【0032】
【表1】
Figure 0003707992
【0033】
【発明の効果】
表1に示すように、本発明により特に処理液の湿潤塗布量として好ましい範囲範(50ミリリットル以下)において、感光材料端部の塗布開始部分における塗布が不均一となりやすかった従来の懸案点を解決することができた。
【図面の簡単な説明】
【図1】本発明の一例を示す断面図
【符号の説明】
1 スロットダイ
2 感光材料
3 搬送ローラー
4 処理液
5 ポンプ
6 バルブ
7 感材検出器
8 処理液供給口
9 マニホールド
10 スリット部
11 部材(液膜形成部材)
12 上下装置
13 処理液膜[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a processing method and a processing apparatus for a photosensitive material. Specifically, the present invention relates to a processing method and a processing apparatus for applying a processing liquid using a slot die.
[0002]
[Prior art]
Photosensitive materials such as films, photographic papers, and printing plates are processed with a processing solution such as a developer, a fixing solution, a stabilizing solution, and washing water after an image is recorded. As a processing apparatus for a photosensitive material that performs such processing, the photosensitive material is transported into a processing tank in which a processing liquid is stored by a transporting means constituted by a plurality of pairs of transporting rollers, and the photosensitive material is immersed in the processing liquid. An immersion type processing apparatus that performs processing by doing so is known.
[0003]
In such an immersion type processing apparatus, the processing solution deteriorates due to processing fatigue associated with the processing of the photosensitive material or fatigue with time due to carbon dioxide or oxygen in the atmosphere. The deterioration of the processing solution is restored. For this reason, the components of the treatment liquid at the start of the treatment are different from the components of the treatment liquid when the treatment is continued thereafter, and it is impossible to perform a strictly uniform treatment. In addition, such an immersion type processing apparatus has a problem that the amount of processing liquid used and the amount of waste liquid are large, the running cost is high, and the maintainability of the apparatus is poor.
[0004]
As a photosensitive material processing apparatus for solving such problems, for example, as described in JP-A-62-237455, instead of immersing a photosensitive material in a processing solution, processing of the photosensitive material is performed. In addition, there is also used a coating type processing apparatus for applying a processing liquid necessary for the photosensitive material to the photosensitive surface of the photosensitive material. For example, in Japanese Patent Application Laid-Open No. Sho 62-237455, as a processing apparatus of such a coating method, a surface is formed by forming a groove on the surface from a processing liquid supply nozzle having a plurality of processing liquid discharge holes. A process of applying the processing liquid by discharging the processing liquid to a roughened roller (hereinafter referred to as a “roughening roller”) and rotating the liquid in contact with the photosensitive material through the roughening roller. An apparatus is disclosed.
[0005]
However, the processing apparatus described in JP-A-62-237455 has a problem that the photosensitive film of the photosensitive material is damaged. Further, from the viewpoint of running cost required for processing and from the viewpoint of environmental problems, etc., it is preferable that the amount of processing liquid used is as small as possible. However, in the above processing apparatus, the amount of processing liquid supplied to the processing liquid supply nozzle is small. In this case, it becomes difficult to make the supply amount of the processing liquid discharged from the plurality of processing liquid holes to the roughening roller uniform, and accordingly, the amount of the processing liquid becomes non-uniform. There is also.
[0006]
In order to remedy this problem, Japanese Utility Model Laid-Open No. 6-8956 and Japanese Patent Application Laid-Open No. 6-27677 have a processing liquid supply unit at the top and a slit-shaped opening at the lower end, and the processing liquid is applied through the opening. A processing apparatus has been disclosed. Although this processing apparatus can achieve a desired purpose in principle, there are problems in performance and stability as an applicator. In other words, since the supply port and the slit are directly connected, it is difficult for the processing solution to spread uniformly over the entire width of the applicator, and because the slit tip and the photosensitive material surface are in contact with each other, it is difficult to form a stable meniscus. There is. As a result, the coating amount of the photosensitive material in the coating width direction and the flow direction is not uniform, and vertical unevenness and liquid cracking (so-called reburette in coating engineering) are likely to occur in the coating surface quality. The problem is solved by increasing the flow rate of the processing liquid (in other words, the wet coating amount), but if the coating amount is increased more than necessary, it is necessary to eliminate the surplus in the subsequent process. In this case, waste liquid is generated.
[0007]
In view of the above problems, the present inventors have proposed in Japanese Patent Application No. 11-361027 a processing apparatus that can stably and evenly apply even a small amount of processing liquid using a slot die and that does not substantially generate waste liquid. . However, some photosensitive materials require uniform development processing from the end, and in particular, processing unevenness at the extreme tip (for example, within 1 cm of the tip) may be a problem. This phenomenon was particularly likely to occur when the coating amount was reduced.
[0008]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION An object of the present invention is to further improve the above-mentioned Japanese Patent Application No. 11-361027. A processing method and a processing apparatus in which uneven application and uneven processing due to the application start portion at the end of the photosensitive material are eliminated. It is to provide.
[0009]
[Means for Solving the Problems]
The above object of the present invention is a processing method for applying a processing solution falling from the slit to a photosensitive material using a slot die comprising at least a slit and a manifold, at a position facing and separating from the tip of the slit. A member having a length equal to or longer than the coating width is installed, and before the photosensitive material reaches the slit portion, a film of a processing solution in a stationary state or between the slit tip portion and the member It was achieved by a method for processing a photosensitive material, characterized in that a film of a processing solution that is not stationary is formed.
[0010]
In order to carry out the above-described processing method of the present invention, there is provided a photosensitive material processing apparatus for applying a processing solution to a photosensitive material using a slot die comprising at least a slit and a manifold, A photosensitive material processing apparatus is preferable in which a member having a length equal to or longer than the coating width is placed at a position opposite to each other within 3 mm from the slit tip.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be specifically described below with reference to the accompanying drawings, but the present invention is not limited to the embodiments shown in the drawings. FIG. 1 is a cross-sectional view of a preferred embodiment of the present invention.
[0012]
1 is a slot die. The material is not particularly limited as long as the corrosion resistance and mechanical accuracy with respect to the treatment liquid can be satisfied. For example, stainless steel is preferable. In addition, chrome-plated general plastics and plastics can be used. In addition, when manufacturing with a metal, in order to exclude the stress distortion at the time of machining, you may anneal beforehand.
[0013]
The structure of the slot die 1 will be described. A processing liquid supply port 8 is connected to the manifold 9. The manifold 9 is for expanding the inflowing processing solution in the width direction, and is an element that is not provided in the above-mentioned Japanese Utility Model Laid-Open Nos. 6-8956 and 6-27677. After the processing liquid is once filled in the width direction with the manifold and is supplied to the slit portion 10, the outflow flow rate from the slit portion 10 can be made uniform in the width direction. The treatment liquid supply port 8 may be normally provided at one center in the width direction of the slot die, but may be provided at a plurality of locations in the width direction of the slot die. The cross-sectional shape of the manifold 9 is circular in this aspect, but is not limited to this and may be any shape. Further, the cross-sectional area of the manifold 9 does not have to be constant in the width direction of the slot die. For example, in order to further improve the flow rate uniformity in the width direction of the outflowing processing liquid, the cross-sectional area is gradually reduced toward the end. Also good.
[0014]
Although not shown in FIG. 1 for convenience, the both ends of the manifold portion of the slot die 1 in the coating width direction and the both ends of the slit portion are plugged so that the processing liquid does not flow out. In this case, the stopper is applied so that the effective length in the width direction of the slit portion is the same as or slightly larger than the application width of the photosensitive material to be processed.
[0015]
A photosensitive material 2 is conveyed from the left to the right in the drawing by a driving device (not shown). The leading end of the photosensitive material 2 being conveyed is detected by the photosensitive material detector 7, and the pump 5 is driven by the signal to open the valve 6 to supply the processing solution 4 to the slot die 1, and the end of the photosensitive material. The basic control flow is to stop the pump 5 and close the valve 6 by detecting this, but the conveyance speed of the photosensitive material 2 and the distance from the photosensitive material detector 7 to the slit portion of the slot die 1 are determined. It is possible to substantially eliminate the loss of the treatment liquid 4 by calculating the distance (the calculation device is not shown) and appropriately controlling the timing of driving / stopping the pump 5.
[0016]
The pump used in the present invention is not particularly limited, but the number of rotations (in the case of a gear pump, etc.) and the number of strokes (in the case of a vibration pump such as a diaphragm type) can be varied. That is, a metering pump is preferable. Also, a pump with less non-uniform flow rate called pulsation is preferable in order to make the coating of the treatment liquid uniform. In some cases, for example, an air damper type pulsation preventer may be installed in the piping passage after the pump. A syringe-type liquid supply device can also be preferably used.
[0017]
In this aspect, an example in which a pump is used for supplying the processing liquid has been described. However, for example, a system in which the processing liquid is disposed at a position higher than the slot die and is naturally dropped by the water head may be used. In this case, a pump is unnecessary, and the processing liquid can be supplied only by opening and closing the valve. In this case, the flow rate can be controlled by making the valve a quantitative formula, or by adjusting the opening degree so that the flow rate with a needle valve, for example, is arranged in the flow path so as to obtain a desired flow rate. . Even in the natural fall method, the loss of processing liquid can be substantially eliminated by controlling the valve opening / closing timing based on the signal of the light-sensitive material detector 7 in the same manner as in the above-described pump type. .
[0018]
When the application amount to the photosensitive material requires extremely high accuracy, a flow meter may be arranged in the processing solution pipe and the above pump and metering valve may be feedback controlled based on the flow meter signal. it can.
[0019]
The supply flow rate of the processing liquid to the slot die can be determined by multiplying the desired wet coating amount of the processing liquid, the photosensitive material coating width, and the photosensitive material conveyance speed, respectively.
[0020]
The conveying roller 3 may be either driven or non-driven, and the material of the roller is not particularly limited and may be one used in a conventional photosensitive material processing apparatus. In consideration of the coating stability of the processing solution, it is preferable to dispose a roller so that the photosensitive material is conveyed substantially horizontally.
[0021]
Although not shown in the present embodiment, in consideration of the possibility that a trace amount of surplus is generated when the treatment liquid is applied, a liquid receiving tray or the like may be disposed below the slot die and recovered.
[0022]
A feature of the present invention resides in that a member 11 having a length equal to or longer than the coating width is disposed at a position vertically below the slit 10 of the slot die 1. 11 is to form a film 13 of the processing solution between the two. Hereinafter, the member 11 is referred to as a liquid film forming member. The up-and-down device 12 is used to position the liquid film forming member 11 in the up-down direction. For example, it is possible to cope with various thicknesses of the photosensitive material to be processed, and it is possible to position the liquid film forming member 11 at the optimum position with respect to the processing liquid application conditions (wetting application amount and processing speed). Further, when the processing apparatus is at rest, the liquid film forming member 11 can be brought into close contact with the tip of the slot die to prevent leakage of the processing liquid. Although a cylinder type actuator is illustrated in FIG. 1, the present invention is not limited to this as long as vertical movement is possible.
[0023]
The liquid film forming member 11 is preferably equal to or larger than the application width of the slot die in the application width direction, and the portion facing the tip of the slit 10 is preferably a flat surface. That is, it is preferable that the photosensitive material flow direction (L in FIG. 1) has a plane having a length of 1 mm or more, more preferably 2 mm or more. There is no. The material is not particularly limited as long as it has corrosion resistance to the treatment liquid. For example, stainless steel, plastics, fluorine-based resin (Teflon, etc.) can be used.
[0024]
The distance H between the liquid film forming member 11 and the tip of the slit 10 (the tip of the slot die 1) will be described in detail. The distance H is preferably 3 mm or less, more preferably 2 mm or less, still more preferably 1.5 mm or less, particularly preferably 1. in order to form a uniform treatment liquid film 13 in the entire width direction with a small coating amount. It is within 0 mm. The lower limit of the distance H is a distance at which the photosensitive surface of the photosensitive material 2 does not contact the tip portion of the slit 10 (tip portion of the slot die 1). Further, it is preferable that the upper surface of the liquid film forming member 11, that is, the liquid contact surface with the processing liquid is offset downward so as to be equal to the lower surface level of the photosensitive material 2 or to the extent that the photosensitive material does not collide. In addition, the treatment liquid contact surface is preferably a horizontal surface. As a result, the treatment liquid film 13 can be formed and maintained in a state in which the treatment liquid film 13 is sufficiently in contact with the tip end portion of the slot die, that is, in a state in which the effects of the present invention are easily exhibited.
[0025]
The present invention aims at a processing method that minimizes the application amount of the treatment liquid and does not substantially generate waste liquid. In that sense, the application amount of the treatment liquid is preferably 50 ml or less per square meter, more preferably About 40 to 20 milliliters. If the coating amount is reduced in this way, uniform processing of the front end portion of the photosensitive material becomes difficult. This is probably because when the coating amount is small, the treatment liquid flowing out from the slit and dropping at the start of the coating is in the form of droplets or sludges, resulting in uneven coating. In order to solve this problem, the present invention forms a treatment liquid film in the full width direction together with the liquid film forming member 11 in advance at the tip of the slit 10 (slot die 1) prior to coating.
[0026]
In the present invention, the processing liquid film 13 is generated between the tip of the slot die and the liquid film forming member 11 before the photosensitive material is applied. The treatment liquid film 13 is generated by supplying the treatment liquid in accordance with the above description about H and the description about the liquid film forming member 11. For example, there is a method in which the driving time of the pump 5 is controlled by a timer (not shown) triggered by a signal detected by the photosensitive material detector 7 that the photosensitive material 2 has passed. Moreover, when using the above-mentioned syringe type liquid supply device instead of the pump, there is also a method of pushing out a certain amount of processing liquid triggered by the above signal. In any of the above-described methods, the processing liquid film 13 can be stably maintained in a stationary state by closing the valve 6 at the timing when the pump or the syringe-type liquid supply device is stopped from the driving state. . Further, in the case where a slight amount of waste liquid of the processing liquid is allowed, a method in which the processing liquid film 13 is formed and applied to the photosensitive material 2 as it is without stopping the pump 5 may be used.
[0027]
The inventors of the present invention apply coating to the photosensitive material 2 in a state where the processing liquid film 13 is generated, so that the coating becomes uneven at the coating start portion at the edge of the photosensitive material, and development unevenness is likely to occur. I found out that I could resolve this issue. In the processing method and processing apparatus using a slot die, the processing liquid that flows out and falls from the slit at the start of coating is considered to have resulted in non-uniform coating because it is in the form of droplets or sag. According to the present invention, since the coating starts from a complete liquid film state over the entire width, the above-described coating unevenness does not occur. Furthermore, when applying to a sheet-like object using the slot die method, the flow rate distribution in the width direction of the processing liquid flowing out from the slit 10 does not reach a steady state at the starting point, and liquid supply such as a pump is provided. The present invention can also compensate for non-uniform coating due to the fact that the flow rate at the start of driving of the apparatus does not reach the desired amount.
[0028]
【Example】
Hereinafter, the present invention will be described by way of examples.
An aluminum lithographic printing plate (all chrysanthemum size) using a silver complex diffusion transfer method using an aluminum plate having a thickness of 0.25 mm as a support as a photosensitive material and having an image output by an output machine using a laser as a light source was used. The composition of the treatment liquid for treating the printing plate is shown below.
Figure 0003707992
[0029]
According to the present invention, a coating test of the above treatment liquid was performed. At this time, the distance H between the tip of the slit 10 and the liquid film forming member 11 was set to 0.95 mm. Further, the upper surface of the liquid film forming member 11 was 0.2 mm below the lower surface level of the photosensitive material 2. The upper surface of the liquid film forming member 11 is a plane having a length L of 3 mm. The conveyance speed (coating speed) of the photosensitive material was 1.5 cm per second, and the wet coating amount of the processing solution was changed from 30 ml to 90 ml per square meter in 10 ml steps.
[0030]
As a comparative example, the liquid film forming member 11 was removed and a coating test was performed under the same conditions as described above.
[0031]
Examples and comparative examples of the present invention are summarized in Table 1. In Table 1, the coated surface quality (development unevenness visually) of the photosensitive material relative to the coating amount of the developer was evaluated.
[0032]
[Table 1]
Figure 0003707992
[0033]
【The invention's effect】
As shown in Table 1, according to the present invention, in the preferred range (50 milliliters or less) particularly for the wet coating amount of the processing solution, the conventional concern that the coating at the coating start portion at the edge of the photosensitive material was likely to be non-uniform is solved. We were able to.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of the present invention.
DESCRIPTION OF SYMBOLS 1 Slot die 2 Photosensitive material 3 Conveying roller 4 Processing liquid 5 Pump 6 Valve 7 Sensitive material detector 8 Processing liquid supply port 9 Manifold 10 Slit part 11 Member (liquid film formation member)
12 Elevator 13 Processing liquid film

Claims (1)

少なくともスリットとマニホールドからなるスロットダイを用いて、前記スリットより落下する処理液を感光材料に塗布する処理方法であって、前記スリットの先端部と対向し離間する位置に、塗布幅と同等もしくはそれ以上の長さを有する部材を設置し、前記感光材料が前記スリット部に到達するに先立ち、前記スリット先端部と前記部材の間に、静止状態の処理液の膜あるいは静止していない処理液の膜を形成させることを特徴とする感光材料の処理方法。A processing method in which a processing solution falling from the slit is applied to a photosensitive material using a slot die comprising at least a slit and a manifold, and is equal to or equal to the coating width at a position facing and separating from the tip of the slit. A member having the above length is installed, and before the photosensitive material reaches the slit portion, a film of a stationary processing solution or a non-stationary processing solution is placed between the slit tip and the member . A method for processing a photosensitive material, comprising forming a film .
JP2000128652A 1999-12-20 2000-04-28 Photosensitive material processing method and photosensitive material processing apparatus Expired - Fee Related JP3707992B2 (en)

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JP2000128652A JP3707992B2 (en) 2000-04-28 2000-04-28 Photosensitive material processing method and photosensitive material processing apparatus
US09/738,980 US6478483B2 (en) 1999-12-20 2000-12-19 Apparatus for processing photosensitive material
DE10063216A DE10063216B8 (en) 1999-12-20 2000-12-19 Apparatus for processing photosensitive material

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